DIY SLA Battery Chargers

A sealed lead-acid (or SLA) battery is often called a “maintenance-free” battery. Unlike conventional lead-acid batteries, a sealed lead-acid battery does not require the periodic addition of distilled water to maintain the necessary electrolyte levels.

nip off the tip from the end of the adapter, and mark the positive wire with the permanent marker. Pull the adapter wires apart to create a separation of approximately four inches between the wire ends. Remove one half inch of insulation from the tips of each wire.

Place one of the ring terminals over the end of the adapter positive wire. Crimp the terminal to the wire.

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The finished product resembles an automotive booster cable set.

Draw a “+” sign on one of the battery connector clamps. Loosen and remove the top screw on this battery clamp. Place the ring terminal over the threaded end of the screw, and place the screw back into the screw hole at the top of the clamp. Tighten the screw so it holds the ring terminal firmly.

Place the second ring terminal over the negative (unmarked) adapter wire, and crimp the ring terminal to the wire.

Loosen the screw from the second battery connector clamp, and remove the screw to expose the screw hole. Place the ring terminal over the threaded end of the screw, and place the screw over the clamp’s screw hole. Tighten the screw into the hole so it holds the ring terminal firmly.

Attach the charger clamp marked with the “+” symbol to the positive battery terminal. Attach the unmarked charger clamp to the negative battery terminal. Plug in the battery charger and allow the battery to charge for approximately six hours.